I agree with cc.
Many experts agree that once a system has been compromised, it's best to nuke it and start over.
Having said that, you can try the following:
1). Do a system restore and return your system to a date that peceeds any problems.
2). Try to force the back button in your internet browser and windows explorer. Open your browser and advance to another site. There is a little black downward arrow just past both the back and forward arrows. If this is not grayed out, click on them and use the dropdowns to force forward and backward activity.
I suspect this won't work, but it only takes a few seconds and no harm done.
3). Utilize a registry tweak such as:
There probably is one on the MS site, but I don't have the next 30 days to hunt for it...:rolleyes:
4.) Use a decent registry cleaner like regseeker...ther's a link in my sig.
It's safe (as cleaners go), free and effective.
Best of luck.